Band-type fan structure

ABSTRACT

A band-type fan structure includes a transmission band body and multiple blades. The transmission band body has a lengthwise direction and a widthwise direction. The blades are side by side disposed on the transmission band body in parallel to each other and arranged in the lengthwise direction of the transmission band body. Each two adjacent blades define therebetween a flow way. The transmission band body is movable in the lengthwise direction, whereby the blades are driven by the transmission band body to transversely move to create an air volume. The band-type fan structure has a greatly minified volume. Also, the band-type fan structure overcomes the shortcoming of unstable operation of the conventional fan caused by deflection of the blades.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates generally to a band-type fan structure, and more particularly to a band-type fan structure, which has a greatly minified volume. Also, the band-type fan structure overcomes the shortcoming of unstable operation of the conventional fan caused by deflection of the blades.

2. Description of the Related Art

Along with the continuous advance of electronic technologies and industries, the density of transistors of various chips (such as central processor and execution unit) has been more and more increased. This enables the central processor to process data at higher and higher speed. However, the power consumption and heat generated by the central processor have also become higher and higher. In order to keep the central processor stably operating, it has become an important topic how to develop high-efficiency heat dissipation unit for dissipating the heat generated by the central processor.

In order to keep a high-efficiency heat dissipation function, the heat dissipation unit has inevitably become larger and larger and heavier and heavier. However, in design of electronic device such as laptop, tablet, intelligent mobile phone and intelligent handheld electronic device, the limitation of space is always a greatest bottleneck of the design process.

Please refer to FIG. 1, which is a perspective assembled view of a conventional fan module 1. The fan module 1 includes a centrifugal fan 10, a heat pipe 11 and a heat dissipation unit 12. The centrifugal fan 10 serves to drive air to flow so as to carry away the heat of the heat dissipation unit 12 and lower the temperature. The performance of the fan module 1 is determined by the wind pressure and air volume of the centrifugal fan 10 and the heat exchange area of the heat dissipation unit. The larger the heat exchange area of the heat dissipation unit 12 is, for example, the longer the radiating fin is, the better the heat dissipation effect of the heat dissipation unit 12 is. However, the increase of the length of the radiating fin will lead to excessively large total volume of the fan module. This fails to meet the requirements for lightweight, slimness and miniaturization of the laptop.

In order to meet the requirements for lightweight, slimness and miniaturization, the respective components are as minified as possible. Therefore, the centrifugal fan is miniaturized. However, due to the miniaturization of the volume, the blades of the centrifugal fan are very thin. This will cause more vibrations and make louder noise.

According to the above, the conventional fan module has the following shortcomings:

1. The volume is larger.

2. The blades tend to deflect to cause unstable operation.

SUMMARY OF THE INVENTION

It is therefore a primary object of the present invention to provide a band-type fan structure, which has a greatly minified volume.

It is a further object of the present invention to provide the above band-type fan structure, which overcomes the shortcoming of unstable operation of the conventional fan caused by deflection of the blades.

To achieve the above and other objects, the band-type fan structure of the present invention includes a transmission band body and multiple blades. The transmission band body has a lengthwise direction and a widthwise direction. The blades are side by side disposed on the transmission band body in parallel to each other and arranged in the lengthwise direction of the transmission band body. Each blade has a main body disposed on a surface of the transmission band body and a first end extending from the main body in the widthwise direction of the transmission band body. Each two adjacent blades define therebetween a flow way. The transmission band body is movable in the lengthwise direction, whereby the blades are driven by the transmission band body to transversely move.

In the above band-type fan structure, the main bodies of the blades are disposed on the surface of the transmission band body with the first ends of the blades extending in the widthwise direction of the transmission band body. When the power member drives the transmission band body to move in the lengthwise direction, the blades are driven by the transmission band body to transversely move. Due to the wing-shaped configuration of the blades and the specific aerodynamic property of the wing-shaped configuration, the airflow around the first ends of the blades are changed to create an air volume through the flow ways. Accordingly, the band-type fan structure can be used instead of the conventional fan to minimize the volume of the fan. Also, the band-type fan structure overcomes the shortcoming of unstable operation of the conventional fan caused by deflection of the blades.

BRIEF DESCRIPTION OF THE DRAWINGS

The structure and the technical means adopted by the present invention to achieve the above and other objects can be best understood by referring to the following detailed description of the preferred embodiments and the accompanying drawings, wherein:

FIG. 1 is a perspective assembled view of a conventional fan structure;

FIG. 2A is a perspective exploded view of a first embodiment of the band-type fan structure of the present invention;

FIG. 2B is a perspective assembled view of the first embodiment of the band-type fan structure of the present invention;

FIG. 3A is a perspective exploded view of the first embodiment of the band-type fan structure of the present invention;

FIG. 3B is a perspective assembled view of the first embodiment of the band-type fan structure of the present invention;

FIG. 4A is a perspective exploded view of a second embodiment of the band-type fan structure of the present invention;

FIG. 4B is a perspective assembled view of the second embodiment of the band-type fan structure of the present invention;

FIG. 5 is a perspective view of a third embodiment of the band-type fan structure of the present invention; and

FIG. 6 is a perspective assembled view of a fourth embodiment of the band-type fan structure of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Please refer to FIGS. 2A and 2B. FIG. 2A is a perspective exploded view of a first embodiment of the band-type fan structure of the present invention. FIG. 2B is a perspective assembled view of the first embodiment of the band-type fan structure of the present invention. According to the first embodiment, the band-type fan structure of the present invention includes a transmission band body 20 and multiple blades 21. The transmission band body 20 has a lengthwise direction 201 and a widthwise direction 202. The blades 21 are side by side disposed on the transmission band body 20 in parallel to each other and arranged in the lengthwise direction 201 of the transmission band body 20. Each two adjacent blades 21 define therebetween a flow way 215. The transmission band body 20 is movable in the lengthwise direction 201, whereby the blades 21 are driven by the transmission band body 20 to transversely move.

Please refer to FIGS. 3A and 3B. FIG. 3A is a perspective exploded view of the first embodiment of the band-type fan structure of the present invention. FIG. 3B is a perspective assembled view of the first embodiment of the band-type fan structure of the present invention. The band-type fan structure of the present invention includes a transmission band body 20 and multiple blades 21. The transmission band body 20 has a lengthwise direction 201 and a widthwise direction 202. The blades 21 are side by side disposed on the transmission band body 20 in parallel to each other and arranged in the lengthwise direction 201 of the transmission band body 20. Each blade 21 has a main body 211 disposed on a surface 203 of the transmission band body 20 and a first end 213 extending from the main body 211 in the widthwise direction 202 of the transmission band body 20. Each two adjacent blades 21 define therebetween a flow way 215.

The blade 21 is wing-shaped. The wing-shaped blade 21 has such an aerodynamic property that the direction of force can be changed due to its shape. For example, a horizontal push force can be converted into lift force or a horizontal rotational torque can be converted into a vertical push force.

Further referring to FIGS. 3A and 3B as well as FIG. 2B, the band-type fan structure further includes a case 22 having at least one bottom board 221 and two sidewalls 222 disposed on two opposite sides of the bottom board 221. The bottom board 221 and the sidewalls 222 together define a receiving space 223 for receiving the transmission band body 20 and the blades 21. The receiving space 223 communicates with the flow ways 214 between the blades 21.

Please now refer to FIGS. 4A and 4B as well as FIG. 3A. FIG. 4A is a perspective exploded view of a second embodiment of the band-type fan structure of the present invention. FIG. 4B is a perspective assembled view of the second embodiment of the band-type fan structure of the present invention. The second embodiment is partially identical to the first embodiment in component and relationship between the components and thus will not be repeatedly described hereinafter. The second embodiment is mainly different from the first embodiment in that the surface 203 of the transmission band body 20 has multiple connected sections 204 arranged in the lengthwise direction 201. One face of the main body 211 of the blade 21, which face is proximal to the transmission band body 20, has a connection section 212 connected to the connected section 204. The connected section 204 is an insertion hole or a threaded hole. The connection section 212 is an insertion pin or a screw. The connection section 212 is connected to the connected section 204 by means of insertion or screwing.

The lengthwise direction 201 and the widthwise direction 202 of the transmission band body 20 together define a passageway 205 in communication with the connected sections 204. The band-type fan structure further includes a power member 3 connected to the transmission band body 20, whereby the blades 21 can be driven by the transmission band body 20 to transversely move. The power member 3 has multiple transmission shafts 31 and a power source 32. The transmission shafts 31 are positioned on two sides of the passageway 205 and connected with the power source 32.

According to the above arrangement, the main bodies 211 of the blades 21 are disposed on the surface 203 of the transmission band body 20 with the first ends 213 of the blades 21 extending in the widthwise direction 202 of the transmission band body 20. When the power member 3 drives the transmission band body 20 to move in the lengthwise direction 201, the blades 21 are driven by the transmission band body 20 to transversely move. Due to the wing-shaped configuration of the blades 21 and the specific aerodynamic property of the wing-shaped configuration, the airflow around the first ends 213 of the blades 21 are changed to create an air volume through the flow ways 215. Accordingly, the band-type fan structure can be used instead of the conventional fan to minimize the volume of the fan. Also, the band-type fan structure overcomes the shortcoming of unstable operation of the conventional fan caused by deflection of the blades.

Please now refer to FIGS. 5 and 3A. FIG. 5 is a perspective view of a third embodiment of the band-type fan structure of the present invention. The third embodiment is partially identical to the first embodiment in component and relationship between the components and thus will not be repeatedly described hereinafter. The third embodiment is mainly different from the first embodiment in that the blade 21 further has a second end 213 extending from the main body 211 in the widthwise direction 202 of the transmission band body 20 opposite to the first end 213. One of the first and second ends 213, 214 of the blade 21 or both of the first and second ends 213, 214 of the blade 21 are made of flexible material.

According to the above arrangement, when the power member 3 is turned on, the transmission band body 20 is driven by the power member 3 to move in the lengthwise direction 201. At this time, the blades 21 are driven by the transmission band body 20 to transversely move. Due to the wing-shaped configuration of the blades 21 and the specific aerodynamic property of the wing-shaped configuration, the airflow around the first and second ends 213, 214 of the blades 21 are changed to create a greater air volume through the flow ways 215. Accordingly, the band-type fan structure can be used instead of the conventional fan to greatly minify the volume of the fan. Also, the swing fan structure overcomes the shortcoming of unstable operation of the conventional fan caused by deflection of the blades.

Please now refer to FIG. 6, which is a perspective assembled view of a fourth embodiment of the band-type fan structure of the present invention. The fourth embodiment is partially identical to the first embodiment in component and relationship between the components and thus will not be repeatedly described hereinafter. The fourth embodiment is mainly different from the first embodiment in that the band-type fan structure includes multiple transmission band bodies 20 and multiple blades 21 disposed on the transmission band bodies 20. The transmission band bodies 20 are serially connected with each other to form a large-size band-type fan structure. This can achieve the same effect as the above embodiments.

In conclusion, in comparison with the conventional fan structure, the present invention has the following advantages:

1. The volume of the fan structure is greatly reduced.

2. The shortcoming of unstable operation of the conventional fan structure caused by deflection of the blades is overcome.

The present invention has been described with the above embodiments thereof and it is understood that many changes and modifications in the above embodiments can be carried out without departing from the scope and the spirit of the invention that is intended to be limited only by the appended claims. 

What is claimed is:
 1. A band-type fan structure comprising: a transmission band body having a lengthwise direction and a widthwise direction; and multiple blades side by side disposed on the transmission band body in parallel to each other and arranged in the lengthwise direction of the transmission band body, each two adjacent blades defining therebetween a flow way, the transmission band body being movable in the lengthwise direction, whereby the blades are driven by the transmission band body to transversely move.
 2. A band-type fan structure comprising: a transmission band body having a lengthwise direction and a widthwise direction; and multiple blades side by side disposed on the transmission band body in parallel to each other and arranged in the lengthwise direction of the transmission band body, each blade having a main body disposed on a surface of the transmission band body and a first end extending from the main body in the widthwise direction of the transmission band body, each two adjacent blades defining therebetween a flow way, the transmission band body being movable in the lengthwise direction, whereby the blades are driven by the transmission band body to transversely move.
 3. The band-type fan structure as claimed in claim 2, further comprising a case having at least one bottom board and two sidewalls disposed on two opposite sides of the bottom board, the bottom board and the sidewalls together defining a receiving space for receiving the transmission band body and the blades, the receiving space communicating with the flow ways between the blades.
 4. The band-type fan structure as claimed in claim 3, wherein the surface of the transmission band body has multiple connected sections arranged in the lengthwise direction, one face of the main body of the blade, which face is proximal to the transmission band body, has a connection section connected to the connected section.
 5. The band-type fan structure as claimed in claim 4, wherein the connected section is an insertion hole or a threaded hole and the connection section is an insertion pin or a screw, the connection section being connected to the connected section by means of insertion or screwing.
 6. The band-type fan structure as claimed in claim 1, wherein the blades are wing-shaped.
 7. The band-type fan structure as claimed in claim 1, wherein the blade further has a second end extending from the main body in the widthwise direction of the transmission band body opposite to the first end.
 8. The band-type fan structure as claimed in claim 7, wherein the first and second ends of the blade are made of flexible material.
 9. The band-type fan structure as claimed in claim 5, wherein the lengthwise direction and the widthwise direction of the transmission band body together define a passageway in communication with the connected sections.
 10. The band-type fan structure as claimed in claim 1, further comprising a power member connected to the transmission band body, whereby the blades can be driven by the transmission band body to transversely move.
 11. The band-type fan structure as claimed in claim 10, wherein the power member has multiple transmission shafts and a power source, the transmission shafts being positioned on two sides of the passageway and connected with the power source. 